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172 Advanced Programming with the VT1529B Chapter 5
Field Wiring of the
VT1586A
The field wiring for the VT1586A, when used with the VT1529B, is
different from the wiring of the VT1586A when used stand-alone. In
particular, with the VT1529B option 002 VT1529B-to-VT1586A cable, the
G (Guard) terminals of the VT1586A are redefined to be the excitation
source and excitation sense terminals for the reference thermistor(s).
Figure 5-4 shows the VT1586A front panel connections. Note that the
Sense + and - terminals for the channels are the same using the VT1586A.
When using the VT1586A with the VT1529B to measure temperature,
instead of using a current source to excite the isothermal reference
thermistor, use a voltage source and a resistor divider network. The
excitation voltage supply that the VT1529B is connected to is routed
through the VT1529A-to-VT1586A cable and is made available on the four
Excitation + and - terminals on the VT1586A for use with the divider. The
recommended thermistor divider circuit is shown in Figure 5-5 and the
recommended field wiring for the divider in shown in Figure 5-6. Note that
the excitation voltage is not being connected to a measurement channel.
Instead, the same dedicated excitation measurement channel on the
VT1529B can be used that was use for strain.
Note The Excitation Sense + and - channels shown in Figure 5-4 are normally
not used. They can be used to “wrap around” the excitation voltage outputs
on the VT1586A to the corresponding measurement channel on the
VT1529B, if necessary.
Figure 5-4. VT1586A Terminal Panel Connections
Ch16
Sense +
Ch17
Sense +
Ch18
Sense +
Ch19
Sense +
Ch16
Sense -
Ch17
Sense -
Ch18
Sense -
Ch19
Sense -
Ch20
Sense +
Ch21
Sense +
Ch22
Sense +
Ch23
Sense +
Ch20
Sense -
Ch21
Sense -
Ch22
Sense -
Ch23
Sense -
Ch20
Ex.Sense +
Ch20
Ex.Sense -
Ch22
Ex.Sense +
Ch22
Ex.Sense -
Ch16
Excitation +
Ch16
Excitation -
Ch18
Ex.Sense +
Ch18
Ex.Sense -
Ch24
Sense +
Ch25
Sense +
Ch26
Sense +
Ch27
Sense +
Ch24
Sense -
Ch25
Sense -
Ch26
Sense -
Ch27
Sense -
Ch28
Sense +
Ch29
Sense +
Ch30
Sense +
Ch31
Sense +
Ch28
Sense -
Ch29
Sense -
Ch30
Sense -
Ch31
Sense -
Ch28
Ex.Sense +
Ch28
Ex.Sense -
Ch30
Ex.Sense +
Ch30
Ex.Sense -
Ch24
Excitation +
Ch24
Excitation -
Ch26
Ex.Sense +
Ch26
Ex.Sense -
Thermistor
Center Sense +
Thermistor
Center Sense -
Thermistor
Right Sense +
Thermistor
Right Sense -
Ground
Trigger
Ch0
Sense +
Ch1
Sense +
Ch2
Sense +
Ch3
Sense +
Ch0
Sense -
Ch1
Sense -
Ch2
Sense -
Ch3
Sense -
Ch4
Sense +
Ch5
Sense +
Ch6
Sense +
Ch7
Sense +
Ch4
Sense -
Ch5
Sense -
Ch6
Sense -
Ch7
Sense -
Ch4
Ex.Sense +
Ch4
Ex.Sense -
Ch6
Ex.Sense +
Ch6
Ex.Sense -
Ch0
Excitation +
Ch0
Excitation -
Ch2
Ex.Sense +
Ch2
Ex.Sense -
Ch8
Sense +
Ch9
Sense +
Ch10
Sense +
Ch11
Sense +
Ch8
Sense -
Ch9
Sense -
Ch10
Sense -
Ch11
Sense -
Ch12
Sense +
Ch13
Sense +
Ch14
Sense +
Ch15
Sense +
Ch12
Sense -
Ch13
Sense -
Ch14
Sense -
Ch15
Sense -
Ch12
Ex.Sense +
Ch12
Ex.Sense -
Ch14
Ex.Sense +
Ch14
Ex.Sense -
Ch8
Excitation +
Ch8
Excitation -
Ch10
Ex.Sense +
Ch10
Ex.Sense -
Current
Out +
Current
Out -
Current
In +
Current
In -
Thermistor
Thermistor
Sense -
Sense +
NOT USED
NOT
USED
NOT USED
Left Side
Right Side